The Green and Red tone cards are only found with numbers 1-40. 41-80 are found with the four colors as with Greenberg.
I think purple and brown are probably the most common, followed by black and then blue. Green and red are the least common of the low number cards. As far as the high numbers, the colors are tough to distinguish online, but blue seems to be somewhat less common than the others.
Yes, red and green, then the high numbers are a different shade of brown, but I'm sure you knew that already
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